首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Researchers at MIT are developing new technology for converting heat into light and then into electricity that could eventually
Researchers at MIT are developing new technology for converting heat into light and then into electricity that could eventually
admin
2018-06-06
94
问题
Researchers at MIT are developing new technology for converting heat into light and then into electricity that could eventually save fuel in vehicles by replacing less-efficient alternators and allowing electrical systems to run without the engine idling. The technology, called thermophotovoltaics, uses gasoline to heat a light-emitting material, in this case tungsten. A photovoltaic cell then converts the light into electricity. The idea has been around since the 1960s, says John Kassakian, MIT electrical engineering and computer science professor. But until now, the light emitters for the photovoltaics produced inefficient and very costly systems. Improvements in the materials used in these latest devices—possible in part because researchers can modify the material structure at the nano-scale—are now making much more efficient systems, Kassakian says.
According to Kassakian, the system could potentially be a more efficient way to power electrical systems in a vehicle than the current alternator-based one, which wastes energy in two stages: the internal combustion engine converts only about 30 percent of the energy in fuel into movement, and then the alternator is only 50 percent efficient in converting the mechanical energy into electricity. He says a small prototype thermophotovoltaics device that could confirm the system’s improved efficiency might be ready in a year.
The researchers modified the surface structure of the light emitter, etching into it nano-sized pits to tune the wavelengths of light emitted to precisely those a photovoltaic cell can convert most efficiently into electricity. They further refined the device with the use of filters that allow the desired wavelengths of light to pass through to the photovoltaic cells, but reflect other wavelengths back to the light emitter. The reflected light carries energy that helps keep the emitter hot, reducing the amount of fuel needed.
In addition to replacing the alternator with a thermophotovoltaic module, says Kassakian, the technology could be part of an air-conditioning system for vehicles that doesn’t require a compressor. Because this would significantly decrease the load on an engine, it could make it possible to turn off the engine when the vehicle stops in traffic and easily restart it. Today’s hybrids use this technique to save gas, but require large batteries to provide electricity for the radio and lights, and to restart the engine, and they have to turn the engine back on when the battery charge runs out. In the new MIT system, these batteries wouldn’t be necessary.
Which of the following statements best summarizes the main idea of the passage?
选项
A、An alternative to alternators.
B、The disadvantages of alternators in vehicles.
C、MIT scientists’ research on energy saving.
D、The replacement of compressors in air-conditionings.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/mmSO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
DemonstratorsrallyatLosAngelesCityHallduringthefirstWomen’sMarch,heldonJan.21,2017,onedayafterPresidentTrum
Thegulfbetweenthetwocountriescannotbebridged,andtheiropinionsaresofarapartthattheycannotbe______.
AlthoughIspoketoheraboutthematterseveraltimes,shetooklittle________ofwhatIsaid.
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthought
Usingextremelydifferentdecoratingschemesinadjourningroomsmayresultindiscordandlackofunityinstyle.
InterpretthefollowingpassagesfromChineseintoEnglish.Startinterpretingatthesignalandstopatthesignal.Youmaytak
A、20%.B、15%.C、10%.D、9%.C根据题干要求可从原文中找到全球旅游业和GDP(国内生产总值)之间的关系。原文第一句提到“Globaltourism...represents10percentofworldGDP...”,
A、Inexpensiveandnice.B、Justso-so.C、Notsatisfactory.D、Indecentandexpensive.C
Whybankruptyourselfinaso-calledoldpeople’shome?Tryahealthspa—itmightactuallybecheaper.SometimesIseeoldl
A、Shehadboughtmorethannecessary.B、ShehadknownJulieallherlife.C、Shetookalongtimechoosingtherightcarpet.D、Sh
随机试题
烟酸降低血脂的机制可能是
网络图中的箭线应保持()。
除当地公积金管理中心有特殊规定外,公积金个人住房贷款必须采用()的支付管理方式。
正确发挥意识能动作用的客观前提是()。
根据以下资料,回答86-90题。2010年5月1日到10月31日,世博会在中国上海举行。自开幕以来,世博会的消费拉动效应初步显现。世博园区共有浦东和浦西两个片区,5月份的销售总额为4.13亿元,其中浦东片区的销售额占89.4%。园区5月份日
我国的国家结构形式属于()。
()isrenownedforitsuniqueplantandanimalspecies.Itisestimatedthattherearearound20,000to25,000different
ScienceandTruth"FINAGLE"isnotawordthatmostpeopleassociatewithscience.Onereasonisthattheimageofthescient
Therelationshipbetweenformaleducationandeconomicgrowthinpoorcountriesiswidelymisunderstoodbyeconomistsandpoliti
Specialisationcanbeseenasaresponsetotheproblemofanincreasingaccumulationofscientificknowledge.Bysplittingupt
最新回复
(
0
)